Johannesburg - One of the military officers implicated in the so-called "Guptagate" landing claims to have text messages in which President Jacob Zuma's name apparently appears often, leading to questions about the president's exact role in the controversial plane landing. Charges against Lieutenant Colonel Christine Anderson and her colleague, Lieutenant Colonel Stephan van Zyl were withdrawn this week, Sapa reported on Tuesday. They had been charged over their involvement in the landing of a private jet, owned by the politically-connected Gupta family, at Waterkloof Air Force Base in April 2013. Civil claimsAccording to the SA National Defence Union, both officers plan to institute civil claims against the state organs which implicated them in the matter. Netwerk24 reported on Wednesday that Anderson has evidence of conversations between her and former head of state protocol, Bruce Koloane, in which Koloane allegedly repeated orders from Zuma in order to make the landing possible. According to the report, Koloane confessed in a disciplinary hearing that he had lied when he said "Number One"(Zuma) had commissioned the landing. He has since been appointed as the country's ambassador to the Netherlands. Koloane may be called to testify in a civil case. Zuma may be subpoenaedThe Times reported on Wednesday that Zuma himself may be called to testify in a civil case about his alleged involvement in the matter. According to Sandu, Zuma needs to explain why his name was mentioned in ensuring that the plane landed at the airport. The implicated officers gave the union permission to pursue civil proceedings, which means anybody can be subpoenaed. Meanwhile, Anderson told Netwerk24 she is glad the charges have been dropped, and that she can now enjoy her retirement.